The automatic rising-lowering system of a hanging gyroscope is designed

in which linear motor controlled by the DSP (Digital Signal Processing) is adopted to automatically rising-lowering the sensitive components of the gyroscope instead of the traditional cam gear manipulated by manpower

and the relevant software and hardware are also designed. In the determination of stability

when the pulse frequency is 26~40 Hz

the gyroscope runs stably and the unilateral swing is 94~210'

when the pulse frequency is 33 Hz

the stability of lowing the gyroscope and north-finding effect are best and the unilateral swing is 105~147'. In the comparative experiments between automatic rising-lowering system and traditional manual operation

the automatic rising-lowering system shows its high stability

low repeat and simple operation. The experiment results indicate that the automatic rising-lowering system has a high stability

and can shorten the north-finding time and improve the precision of north-finding.